Also, the sand shark family are so named because they spend most of their time at the sea floor as opposed to open water, not because they come up on land (which no shark does).
At any rate, Gabaraisu is a land-dwelling but definitely shark-like creature. The idea of "land shark" has embedded itself in popular culture since SNL, as Archaic hits upon. If not directly influenced by SNL, I do believe Creatures Inc. surely had the phrase "land shark" in their minds when they came up with Gabaraisu. This guy harks back to the creativity and fun of the first generation of monsters--and mesa like.